add an extra body for testing. slightly better zoom behavior

src/main.cpp

@@ -80,7 +80,7 @@ void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
     glm::vec4 k = camera_t[2];
     float d = yoffset;
 
-    camera_loc += k * (-d * glm::length(camera_loc) / 10);
+    camera_loc += k * (d/10 * std::max(glm::length(camera_loc), 1.0f));
 
     camera_t = glm::lookAt(camera_loc, focal_point, up);
 }
@@ -138,6 +138,14 @@ int main() {
         return -1;
     b.shader = shader;
     b.pose = glm::translate(b.pose, glm::vec3(0, 0, 0));
+    b.color = glm::vec4(0.5, 0, 0, 1);
+
+    body b2;
+    if (!load_body(&b2, "Icosphere.obj"))
+        return -1;
+    b2.shader = shader;
+    b2.pose = glm::translate(b.pose, glm::vec3(2, 0, 0));
+    b2.color = glm::vec4(0, 0.5, 0, 1);
 
     //glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
     //set_uniform(shader, "color", glm::vec4 { sin(time), sin(time + glm::radians(45.0f)), sin(time + glm::radians(90.0f)), 1.0 } / 2.0f);
@@ -154,10 +162,11 @@ int main() {
     while (!glfwWindowShouldClose(window)) {
         process_input();
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+        set_uniform(shader, "camera_t", camera_t);
+        set_uniform(shader, "projection_t", projection_t);
         
-        set_uniform(b.shader, "projection_t", projection_t);
-        set_uniform(b.shader, "camera_t", camera_t);
-        draw_body(b);
+        draw_body(b);        
+        draw_body(b2);
 
         glfwSwapBuffers(window);
         glfwPollEvents();

src/shaders/fragment.glsl

@@ -7,10 +7,10 @@ in vec3 frag_pos;
 out vec4 frag_color;
 
 void main() {
-    vec3 dx = dFdx(frag_pos) * 100;
-    vec3 dy = dFdy(frag_pos) * 100;
+    vec3 dx = dFdx(frag_pos) * 500;
+    vec3 dy = dFdy(frag_pos) * 500;
     vec3 N = normalize(cross(dFdx(frag_pos), dFdy(frag_pos)));
-    frag_color = color + vec4(N/2, 1)/3;
+    frag_color = color + vec4(N/2, 1)/2;
     //frag_color = vec4(length(dx), length(dy), length(dy), 1.0);
     //frag_color += color;
 }